Gay couples can marry in South American country on Aug. 1
State Department initially denied her request to attend Equality Forum in Philadelphia
The measure failed by a 51-17 vote margin
Same-sex marriage bill received final approval on April 17.
"Mariage pour tous" bill passed by 331-225 vote margin
Six activists took part in State Department-sponsored trip
Advocates claim rhetoric against bill has sparked anti-gay violence
Gays and lesbians can begin to marry in August
Parliament vote to take place
79 percent of 100 members supported recommendation, 2014 referendum possible